Philoxenos of Cythera

A most distinguished dithyrambic poet. He was invited to the
court of Dionysius of Syracuse, who placed some poems in his hand to
correct. Philoxenos said the only thing to do was to run a
line through them and put them in the fire. For this frankness he was
cast into prison, but, being released, he retired to Ephesus. The case
of Voltaire and Frederick II. the Great of Prussia is an exact
parallel.